"According to AK-47 legend, assault rifles were not popular because of their tendency to consume large amounts of ammo. The Soviets embraced the idea and simply supplied their troops with more ammo. Kinda like Redis and RAM."
That's obviously just a legend. This debate was actually carried out in the 2nd half of the 19th century, starting with the Civil War. (Many repeating rifle designs were offered to the Union. Quartermasters repeatedly shut them down on account of expected difficulties with ammo supply. After much time and effort, a few repeating rifles made it through, particularly to the cavalry, where they proved quite decisive in the last year of the war. See Five Forks, for instance.)
That's not exactly true. The SA80 isn't exactly new. It was in use during the Falklands for example. And the British Army used a version of FN FALs before the SA80s were adopted, and those were also automatic rifles.
Now, I'm pretty sure 'automatic' fire was burst limited. But that's pretty much nearly universally accepted as a good idea in main infantry rifles.
The LSW variant has always been fully auto and is 25 years old, and the L85 is to this day semi-automatic and is the main rifle in use in the British army. I don't see how they've "only just relented". Full auto isn't that useful anyway! The ability to empty your magazine in a second comes in handy less often than you'd think.
In fact the US Army's M16 was changed from automatic to semi-automatic, so it seems there is a movement in the other direction.
That's obviously just a legend. This debate was actually carried out in the 2nd half of the 19th century, starting with the Civil War. (Many repeating rifle designs were offered to the Union. Quartermasters repeatedly shut them down on account of expected difficulties with ammo supply. After much time and effort, a few repeating rifles made it through, particularly to the cavalry, where they proved quite decisive in the last year of the war. See Five Forks, for instance.)